linux-kernel - [PATCH] mailbox: qcom-ipcc: Enable loading QCOM

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Date:   Fri, 16 Jul 2021 13:19:46 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Jassi Brar <jassisinghbrar@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] mailbox: qcom-ipcc: Enable loading QCOM_IPCC as a module

This patch enables the qcom_ipcc driver to be loaded as a
module. IPCC is fairly core to system, so as such it should
never be unloaded. It registers as a mailbox + irq controller
and the irq controller drivers in kernel are not supposed to
be unloaded as they don't have the visibility over the clients
consuming the irqs. Hence adding supress_bind_attrs to disable
bind/unbind via sysfs.

Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
---
 drivers/mailbox/Kconfig     | 2 +-
 drivers/mailbox/qcom-ipcc.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index b4b780ea2ac8..c9fc06c7e685 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -264,7 +264,7 @@ config SPRD_MBOX
 	  you want to build the Spreatrum mailbox controller driver.
 
 config QCOM_IPCC
-	bool "Qualcomm Technologies, Inc. IPCC driver"
+	tristate "Qualcomm Technologies, Inc. IPCC driver"
 	depends on ARCH_QCOM || COMPILE_TEST
 	help
 	  Qualcomm Technologies, Inc. Inter-Processor Communication Controller
diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
index 584700cd1585..f1d4f4679b17 100644
--- a/drivers/mailbox/qcom-ipcc.c
+++ b/drivers/mailbox/qcom-ipcc.c
@@ -277,6 +277,7 @@ static struct platform_driver qcom_ipcc_driver = {
 	.driver = {
 		.name = "qcom-ipcc",
 		.of_match_table = qcom_ipcc_of_match,
+		.suppress_bind_attrs = true,
 	},
 };
 
-- 
2.25.1